esp-idf/components/esp32/include/esp_deepsleep.h

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __ESP_DEEPSLEEP_H__
#define __ESP_DEEPSLEEP_H_
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup Deep_Sleep_API Deep Sleep API
* @brief API for putting device into deep sleep
*/
/** @addtogroup Deep_Sleep_API
* @{
*/
/**
* @brief Set the chip to deep-sleep mode.
*
* The device will automatically wake up after the deep-sleep time set
* by the users. Upon waking up, the device boots up from user_init.
*
* @attention The parameter time_in_us to be "uint64" is for further development.
* Only the low 32 bits of parameter time_in_us are avalable now.
*
* @param uint64 time_in_us : deep-sleep time, only the low 32bits are avalable now. unit: microsecond
*
* @return null
*/
void system_deep_sleep(uint64_t time_in_us);
/**
* @brief Default stub to run on wake from deep sleep.
*
* Allows for executing code immediately on wake from sleep, before
* the software bootloader or esp-idf app has started up.
*
* This function is weak-linked, so you can implement your own version
* to run code immediately when the chip wakes from
* sleep.
*
* For example:
* @code
* void RTC_IRAM_ATTR esp_wake_deep_sleep(void) {
* esp_default_wake_deep_sleep();
* // Add additional functionality here
* }
*
* (Implementing this function is not required for normal operation,
* in the usual case your app will start normally when waking from
* deep sleep.)
*
* esp_wake_deep_sleep() functionality is limited:
*
* - Runs immediately on wake, so most of the SoC is freshly reset -
* flash is unmapped and hardware is otherwise uninitialised.
*
* - Can only call functions implemented in ROM, or marked RTC_IRAM_ATTR.
*
* - Static variables marked RTC_DATA_ATTR will have initial values on
* cold boot, and maintain these values between sleep/wake cycles.
*
* - Read-only data should be marked RTC_RODATA_ATTR. Strings must be
* declared as variables also using RTC_RODATA_ATTR, like this:
* RTC_RODATA_ATTR const char message[] = "Hello from very early boot!\n";
*
* - Any other static memory will not be initialised (either to zero,
* or to any predefined value).
*
*
* - If you implement your own stub, the first call the stub makes
should be to esp_default_wake_deep_sleep().
*/
void esp_wake_deep_sleep(void);
/**
* @brief Function type for stub to run on wake from sleep.
*
*/
typedef void (*esp_deep_sleep_wake_stub_fn_t)(void);
/**
* @brief Install a new stub at runtime to run on wake from deep sleep
*
* If implementing esp_wake_deep_sleep() then it is not necessary to
* call this function.
*
* However, it is possible to call this function to substitute a
* different deep sleep stub. Any function used as a deep sleep stub
* must be marked RTC_IRAM_ATTR, and must obey the same rules given
* for esp_wake_deep_sleep().
*/
void esp_set_deep_sleep_wake_stub(esp_deep_sleep_wake_stub_fn_t new_stub);
/**
* @brief Return current wake from deep sleep stub, or NULL if
* no stub is installed.
*/
esp_deep_sleep_wake_stub_fn_t esp_get_deep_sleep_wake_stub(void);
/* The default esp-idf-provided esp_wake_deep_sleep() stub.
If you replace esp_wake_deep_sleep() in your program, or use
esp_set_deep_sleep_wake_stub(), then it is recommended you call
esp_default_wake_deep_sleep() as the first function in your stub.
*/
void esp_default_wake_deep_sleep(void);
/**
* @}
*/
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* __ESP_SYSTEM_H__ */